Sorry for late reply and inconvenience.
Thanks for all these additional information.
I understand your concern.
Well as you describe,A localized lesion or abnormality in the gum itself.
And other possible cause may include inflammatory periodontal disease.
You should do cool compresses with either cold water or putting ice pack on affected area.
You should also use an antibacterial mouth rinse that contains chlorhexidine.
If bleeding is still persistent then see your dentist or visit emergency room ASAP for prompt management.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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